diff --git a/.cross_rubies b/.cross_rubies
index f9828f42a8..37cae1d6b9 100644
--- a/.cross_rubies
+++ b/.cross_rubies
@@ -1,3 +1,4 @@
+3.0.0-preview1:x86_64-darwin
 2.7.0:i686-w64-mingw32
 2.7.0:x86_64-w64-mingw32
 2.7.0:i686-linux-gnu
diff --git a/scripts/setup-osx-native-builders b/scripts/setup-osx-native-builders
index 9dc8e3c822..3f9b237017 100755
--- a/scripts/setup-osx-native-builders
+++ b/scripts/setup-osx-native-builders
@@ -32,6 +32,10 @@ for ruby in $RUBIES ; do
   ruby_fullname="native-builder-${ruby}"
   ruby_minor="${ruby}.0"
 
+  if [[ $ruby == "3.0" ]] ; then
+    ruby="3.0.0-preview1"
+  fi
+
   rbconfig=$(echo ${RUBIES_DIR}/${ruby_fullname}/lib/ruby/${ruby_minor}/*/rbconfig.rb)
   if [[ ! -e $rbconfig ]] ; then
     echo "installing $ruby_fullname ..."